Just get the full Speedpray covers or carry a pair of thongs
https://xeroshoes.com/shop/sandals/cloud-mens-barefoot-sandal/
That would probably be the sensible option.
Seriously. Different shoe setup right before 4000k ride is mad. You need a lot better reason than "I don't want to walk in cleats" to change pedal system. How much walking do you expect to be doing out of the 4000k?
@frank9755 started
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Just get the full Speedpray covers or carry a pair of thongs
https://xeroshoes.com/shop/sandals/cloud-mens-barefoot-sandal/